Josef laumann



(N0 Model.)

J. LAUMANN. REPEATING PIRBARM.

Patted V111,'19, 1892.

UNITED STATES lATENT OFFICE..

JOSEF LAUMANN, OF VIENNA, AUSTRIA-HUNGARY, ASSIGNOR TO THE LUDW. LOElVEit COMPANY COMMANDIT-GESELLSOHAFT AUF ACTIEN, OF BER- LIN, GERMANY.

REPEATING FIREARNI.-

SPECIFICATION forming part of Letters Patent No. 479,284, dated July 19,1.892.

Application filed May 12,1890. Serial No. 351,558. (No model.)

T a/ZZ whom it may concern:

Be it known that I, JOSEF LAUMANN, a subject of the Emperor of Austria,residing at Vienna, Austria-Hungary, have invented a new and usefulImprovement in Repeating Firearms and Ammunition for the Same; and IA dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to letters of reference markedthereon, which form a part of this specification.

The invention relates to improvements in repeating iirearms; and itsgeneral object is to increase the number ot shots which can be fired ina given time. This general object is accomplished by the combination ofthe following subsidiary improvements, each having its special object:first, improvements in the cartridge-magazine; second, improvements inthe cartridge feeder; third, improved cartridge-stop; fourth, improvedtrigger and breech-bolt mechanism; fth, improved safety mechanism.

Itis by the mutual co-operation of the above subsidiary improvementsthat the general object of the invention is attained; and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, and one which will enable others skilled in the art towhich it appertains to carry it into practical effect, reference beingmade to the accompanying drawings, in which- Figure 1 is a sectionallongitudinal elevation showing the arm in the firing position. Fig. lLLis a plan of the bottom of the magazine-chamber. Fig. 2 is a detailelevation of the trigger, breech-bolt, and safety mechanisms, showingthe trigger and breech-bolt in the cocked position. Fig. 3 is an endelevation of the safety mechanism. Fig. 4 is a side elevation of thebreech-bolt and locking-bar. Fig. 5 is a section taken on the line a; o@of Fig. 4. Fig. 6 is a rear elevation of the trigger. Fig. 7 is a sideelevation of the trigger. Figs. S, 8b, and 8@ are respectively sideelevation, rear elevation, and plan of a cartridge-magazine. Fig. 9 is adetail illustrating the construction and operation of the magazine-stop.

I. The cartridge-magazine.-This part of the invention is illustrated inFigs. l, 8a, 8b, and SC. lt resembles the Marmlicher magazine to theextent 01: being open in front and at both top and bottom, but differsfrom it in respect to the sides. 713.13 are two vertical (or nearly so)slots formed in each side of the magazine Those in one side arerespectively opposite those in the other. z" 'i' are iiutes or concavecorrugations stamped in the sides of the magazine and these alternatewith convex corrugations. They extend from one slot 713 to its fellowslot in the same side, as illustrated in Figs. l and S, and thecorrugations in one side are respectively opposite those in the other,the convex corrugations thereby forming seats i' or the cartridges. Thepresence of the slot imparts a degree of resilience to those portions ofthe two sides, respectively, between them, so that when a cartridge ispushed into the magazine from the top the said portions spring outwardand then return, grasping the cartridge by its sides, not tightly, as ina vise, but allowing of alittle play. The seat for the bottom cartridgesis formed by the incurved bottom edges 4 ot the magazine sides, and thetop cartridge is shown as resting upon the top edges ot` the seat of thesecond one.

II. The ccm'tridge-fcedcr.-Referring to Fig. l, e is themagazine-chamber. It is, as heretofore, open at the top for theinsertion of a charged magazine. The bottom f has, likewise, an openingin it to allow of the emptied magazine dropping out. g is thefeeding-lever, and g its fulcrum. g:a is a finger above the lever g andpivoted to its nose. h is the actuating-spring of the lever g. It is ofa spiral form and bears upon the bottom f of the magazine-chamber, asillustrated in Fig. l. h is a stud fast on the top or operative end ofthe said spring, and through it the resilient power of the spring bearsupon the under side of the lever g. The function of this lever is toraise the column ot cartridgesto the extent of presenting the top of therim of the then top cartridge in front of the breechbolt b when thelatter is cocked-z'. e., drawn back into its cylinder or casing c, (seeFig. 2,) and the strength of the spring 71, is adjusted accordingly. Thefunction ot' the finger g2 is to always keep the cartridge-noses tippedup, so that when the breech-bolt engages behind the rim of the top onethe nose will head directly for the bore of the breech. To enable it todo this, a small spring g3 is fitted between the finger and lever, so asto raise the free end of the finger.

III. The cartridge-fmagaeine stop-This part of my invention isillustrated in Figs. l, 8, 8b, 8C, and 9. i2 is the stop. It is a blockor stud fast upon the back ot' the cartridgemagazine. (See Figs, l, 8,Sh, and 8.) The bottom left-hand corner of the stud is cut away, therebyproducing an incline, as illustrated in Fig. 8b, for a reason to beexplained presently. Referring to Fig. 9, 7c is a bolt working in atransverse socket formed for it in the side and back of themagazine-chamber. Its head 7c presents itself on the righthand side ofthe arm. 7c3 is a spring surrounding an axial cotinuation 7a2 of thebolt and acting between the end of the socket and the end of the bolt,being thereby adapted to keep the head 7c projecting. 704 is a groove inthe under side of the bolt, extending from the head for a shortdistance. The nose of the screw 7c5 enters this groove for the purposeof preventing the bolt being moved too far outward, the length of thegroove being adjusted accordingly. A notch is cut down the front face ofthe bolt, leaving a projection k6. One side of this notch,that next tothe head 7c', is vertical, while the opposite side, belonging to theprojection 706, is inclined tothe same hand as the incline on the studi2. Consequently the notch is wider at the top than at the bottom. Thebottom of the projection kf" is cut awayso as to produceaplanehorizontalface 757. The projection k6 and face 7.97 togetherform the detent. The projection 766 is so placed that when it is in itsnormal position under the resilient action of the spring 7c3, the face757 will be immediately over the stop i* when the magazine is in themagazine-chamber.

The operation of my improved magazinestop is as follows: As a magazinet' is being pushed down into the chamber e, the incline on the stop 012engages the top of the incline 7c, and the side of the descending studpushes it inward against the power of the springs 7e3; but as soon asthe top face of the stud i2 is past the face 757 of the projection 7st",the latter is returned to its normal position by the spring 7c3 over thestud i2, thereby locking the magav zine in the chamber. If, however, itshould be desired to at any time unload the magazine-chamber, then thebolt 7c is forced inward by pressing upon its head 7c', whereupon themagazine is freed from the detent and may be lifted out of the chamber cthrough the open top thereof.

IV. The trigger cmd breech-bolt mecha/nz'sm.-This part of my inventionis illustrated in Figs. l, 2, 4, 5, 6, and 7. d is the trigger, a itspivot, and cl its lever-spring. On the inner face-that is, on the rightside of the tri gger-two shoulders d3 d4 are formed. The lever-springbears upon the former to hold the trigger cocked-i. e., in the positionilustrated in Fig. 2-and upon the latter to hold it in the firingposition-11e., the one illustrated in Fig. l. b is the breech-bolt. Itslides to and fro within its cylinder, which is bored through thebreech-block c. b3 is a locking-bar pivoted on a pin b2, projecting fromthe left-hand side of the breech-bolt. A suitable slot is cut in theleft-hand side of the breech-bolt cylinder, in which the locking-bar canslide to and fro. b) b7, Fig. l, are respectively the front and backstud upon the locking-bar b3, one on either side of the trigger. It isthrough these studs alternately that the trigger is placed in operativeconnection with the breech-bolt. The opposite edges of the trigger areconcaved, to make contact with the respective studs easy. c is a notchcut in the under side of the cylinder of the breech-bolt b of a properposition and contour to receive and hold the operative nose b4 of thebreech-bolt locking-bar b3 when the bolt is in the firing position. Thisnotch is clearly shown in Fig. 2, while Fig. l shows the boli lockedaccordingly. The object of this locking is to enable the breech-bolt toresist the explosion of the charge. Assuming that the trigger iscocked-2'.. e., in the position illustrated in Fig. Z-the rear edge ofthe top of the trigger is bearing against the back stud b7. When thetrigger-eye is pulled the front edge of the top of the trigger engageswith the front stud bx, thereby pushing the breech-bolt forward into thering position; but by the time the operative nose b4 of the locking-boltb3 reaches the notch c the concaved front edge of the trigger top bearsupon the top of the stud bx, and as the trigger top is moving downwardthrough an arc of a circle the said nose b4 is pulled down to the bottomof the notch o and held there by the complete contact between the convextop of the stud bX and the respective concave front edge of the triggertop. (See Fig. 1.) At this moment the concave back edge of the triggertop is partlyjust in front of and partly under the back stud b7. Assoon, therefore, as the trigger-eye is pushed forward, for the purposeof cooking, the concave back edge aforesaid engages the said stud b7,lifts the nose b4 of the locking-bar out of the notch c', causes theback end of the locking-bar to enter the bofore-inentioned slot in theside of the breech-bolt cylinder, and finishes by completing thecock-z'. e., by returning the parts mentioned into the positionillustrated in Fig. 2.

V. The safety mechcmism-This part of my invention is illustrated inFigs. l, 2, 3, 4, and 7, and its objects are as follows: (c) to IIO lockthe trigger in the cocked position; (ZJ) to lock the trigger in thetiring position; (c) to lock the firing-pin back.

The first object of this part of my invention is attained as follows: Z2is a lever having its fulcrum in a screw-pin Z', by which it is held inthe vertical plane upon and to the end plate fm of the arm, into whichplate the said screw enters. ZS is a thumb-bit by means of which thelever can be moved about its fulcrnm Z', as may be required for thispart of my invention. Z4 is a tooth formed upon the upper arm of thelever. ZJX is a notch in the breech-bolt b, and when the latter is drawnback the thumb-bit ZS is pushed up, causing the tooth Z4 to enter thesaid slot, and as the trigger and breech-bolt cannot be movedindependently of each other this entrance of the tooth intothe slot willlock the trigger in the cocked position. This is the positionillustrated in Fig. 2.

The second object of this part of my invention is attained as follows:Z7 is a lockingbolt. It lies in a horizontal position in a`slot m',formed in the end plate fm, in which it can work freely. Incross-section this slot is arc-shaped, as indicated by dotted lines inFig. 3. The front end of the bolt projects forward into the chamber ofthe breech mechanism, while the rear end projects into and through aslot ZX wide enough to work freely past the bolt Z7 in the lever Z2, bymeans of which projection an operative connection is established betweenthe said bolt and lever. Both the above-mentioned slots Z and m arestruck from the fulcrum Z of the lever Z2 as a center. m2 is a collar orshoulder upon the bolt on the front side of the lever Z2, and m3 ashouldered screw entering the bolt axially from the rear face of thelever. By means of these two devices the bolt is kept at a right anglewith the lever. Z5 is the operative nose of the lockingbolt, and a5 anotch in the rear edge of the trigger, where the engagement between boltand trigger takes place. If the thumb-bit Z8 is pushed upward, thebottom of the slot Z engages the rear end of the locking-bolt and pushesthe latter up to the top of the slot fm2, when the front end of the boltwill stand in the notch a5 and in the path of the trigger, therebylocking the latter in the firing position. This is the positionillustrated in Figs. 1 and 3. The unlocking of the trigger from eitherof the above-described positions is effected by depressing the thumb-bit ZS. It should be pointed out that there is a certain amount of idlemotion on the part of the lever ZZ-ft'. e., until the top of the slot ZXbears upon the top of the rear end of the bolt Z7, and vice versa withrespect to any subsequent locking.

The third object of this part of my invention is attained as follows: hlis a notch cut in the side of the firing-pin on the side next the leverZ2 and at the proper distance from the rear end of the pin for suchnotch to lie in the plane of the travel of the lever when thebreech-bolt is in the tiring position. (See Fig. l.) It' the thumb-bitZ8 is then pushed upward the tooth Z4, already described, will enter thesaid notch'and lock the tiring-pin back. This position, also, isillustrated in Figs. l and 3. Z3 is a spring tooth adapted toautomatically engage in notches in the periphery of the lever Z2, forthe purpose of holding it in either of its terminal positions.

I claim 1. A cartridge-magazine having a pair of vertical or nearlyvertical slots in the opposite sides thereof, the slots in one side ofthe magazine being respectively opposite to those in the other side ofthe same, and convex corrugations extending from one slot to its fellowslot in the same side, the convex corrugations in one side beingrespectively opposite to the convex corrugations in the other side, anda convex corrugation with the corresponding one opposite to it forming aseat for one cartridge, as set forth.

2. The combination, with the cartridgemagazine, of a stop on the backthereof, having one of its bottom corners cutaway, therebyproducing anincline, a bolt Working in a transverse socket in the side and back ofthe magazine-chamber, the head of which bolt projects through the saidside and presents itself at the side of the arm, anotch cut in the frontface of the said bolt, having one of its sides inclined and adapted inrespect of its position to be engaged by the above-mentioned incline onthe stop on the back of the magazine, an internal spiral spring adaptedto keep the head of the said bolt projected through the said side of themagazine-chamber, and a plane horizontal face in the under side of thesaid bolt communicating with the inclined side of the said notch in theface of the said bolt and adapted to be locked above the said stop onthe back of the magazinechamber by the resilient action of the saidspring, as setforth.

3. The combination of abreech-bolt,alock ing-bar pivoted on the sidethereof, a notch in the breech-bolt cylinder adapted in respect ofcontour and position to receive the operative nose of the saidlocking-bar when the breech-bolt is in the firing position,a front studon the said locking-bar adapted to be engaged by the forward motion ofthe trigger top and to pull the operative nose of the locking-bar intothe said notch, and a back stud on the said locking-bar adapted to beengaged by the cocking motion of the trigger top and to raise the saidnose out otl the said notch, as set forth.

4. The combination of a lever in the vertical plane and having itsfulcrum in the end plate of the arm, a horizontal locking-bolt withinthe chamber of the breech mechanism,

IOO

IIO

the rear end of which bolt projects through an arc-shaped slot in thesaid end plate and also through a second slot in the said lever, a ismoved about its fulerum in the opposite lateral extension on theinternal end of the direction, as set forth.

said bolt adapted to be moved out of the path In testimony whereof Ihave signed this of the trigger by the engagement of thearespecification in the presence of two subscrib- 5 shaped slot in thelever with the rear end ot ing witnesses.

the looking-bolt When the said lever is moved JOSEF LAUMANN about itsfulcrum in one direction and to stand just in front of the trigger, thelatter Vit-nesses:

being in the cocked position and just behind NETTIE S. HARRIS, 1o it ifin the firing position when the said lever RUDOLF VON CLAAK.

